Ornamerdal Plants 433 



the disease reappears, the whole plant should be dug up 

 and burned. In beds where the disease has occurred, a 

 dormant spray should be applied in early spring. Another 

 rust is due to Earlea speciosa (Fr.) Arth. — Though much like 

 the last, this is limited in its attack to the stems, rarely 

 petioles. The sori are irregular and black. Since the causal 

 fungus is perennial in the stems, excision and burning are to 

 be practiced. 



Anthracnose (Gloeospoi-imn rosce Hal.). — This anthrac- 

 nose is very similar to that of the raspberry. The diseased 

 canes, bearing small, pale leaves, die from the tip backward 

 for 2-3 dm., and red acervuli appear upon them after death. 

 Often the canes become completely defoliated. 



Affected plants should be sprayed with Bordeaux mix- 

 ture or ammoniacal copper carbonate. 



Leaf-spot (Mycosphcerella rosigena E. & E.). — The leaves 

 are marked with gray, irregular, indefinite blotches which 

 bear minute black perithecia in their centers. Another 

 leaf-spot is due to Cercospora rosceicola Pass. Circular, gray 

 spots bordered with dark purple but without pycnidia are 

 present. 



Downy-mildew (Peronospora sparsa Berk.). — This mil- 

 dew is kin to that of the grape. Its spots are indefinite, and 

 the characteristic, downy, white to purple coating is noted 

 upon the lower surfaces of the leaves. It is not common in 

 America. Bronzing, its name indicating its character, 

 occurs frequently. It is not due to parasites and does no real 

 harm. 



Crown-gall. See peach. 



SEDUM 



Leaf-spot {Septoria sedi West.). — Dark, circular blotches 

 appear upon the leaves and result in such defoliation that the 

 stems often become naked nearly to the tips of the branches. 

 Infected parts should be burned. Anthracnose {V ermicularia 

 telephii Karst.). — This disease usually appears first at the 



